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amiga floppy: Stop sharing request queue across multiple gendisks

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o Use one request queue per gendisk instead of sharing request queue

o Don't have hardware. No compile testing or run time testing done. Completely
  untested.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Vivek Goyal 2010-09-24 20:35:44 +02:00 committed by Jens Axboe
parent 488211844e
commit 786029ff81
1 changed files with 48 additions and 11 deletions
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59
drivers/block/amiflop.c
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@ -114,8 +114,6 @@ static unsigned long int fd_def_df0 = FD_DD_3; /* default for df0 if it does
module_param(fd_def_df0, ulong, 0);
MODULE_LICENSE("GPL");
static struct request_queue *floppy_queue;
/*
* Macros
*/
@ -164,6 +162,7 @@ static volatile int selected = -1; /* currently selected drive */
static int writepending;
static int writefromint;
static char *raw_buf;
static int fdc_queue;
static DEFINE_SPINLOCK(amiflop_lock);
@ -1334,6 +1333,42 @@ static int get_track(int drive, int track)
return -1;
}
/*
* Round-robin between our available drives, doing one request from each
*/
static struct request *set_next_request(void)
{
struct request_queue *q;
int cnt = FD_MAX_UNITS;
struct request *rq;
/* Find next queue we can dispatch from */
fdc_queue = fdc_queue + 1;
if (fdc_queue == FD_MAX_UNITS)
fdc_queue = 0;
for(cnt = FD_MAX_UNITS; cnt > 0, cnt--) {
if (unit[fdc_queue].type->code == FD_NODRIVE) {
if (++fdc_queue == FD_MAX_UNITS)
fdc_queue = 0;
cotinue;
}
q = unit[fdc_queue].gendisk->queue;
if (q) {
rq = blk_fetch_request(q);
if (rq)
break;
}
if (++fdc_queue == FD_MAX_UNITS)
fdc_queue = 0;
}
return rq;
}
static void redo_fd_request(void)
{
struct request *rq;
@ -1345,7 +1380,7 @@ static void redo_fd_request(void)
int err;
next_req:
rq = blk_fetch_request(floppy_queue);
rq = set_next_request();
if (!rq) {
/* Nothing left to do */
return;
@ -1682,6 +1717,13 @@ static int __init fd_probe_drives(void)
continue;
}
unit[drive].gendisk = disk;
disk->queue = blk_init_queue(do_fd_request, &amiflop_lock);
if (!disk->queue) {
unit[drive].type->code = FD_NODRIVE;
continue;
}
drives++;
if ((unit[drive].trackbuf = kmalloc(FLOPPY_MAX_SECTORS * 512, GFP_KERNEL)) == NULL) {
printk("no mem for ");
@ -1695,7 +1737,6 @@ static int __init fd_probe_drives(void)
disk->fops = &floppy_fops;
sprintf(disk->disk_name, "fd%d", drive);
disk->private_data = &unit[drive];
disk->queue = floppy_queue;
set_capacity(disk, 880*2);
add_disk(disk);
}
@ -1743,11 +1784,6 @@ static int __init amiga_floppy_probe(struct platform_device *pdev)
goto out_irq2;
}
ret = -ENOMEM;
floppy_queue = blk_init_queue(do_fd_request, &amiflop_lock);
if (!floppy_queue)
goto out_queue;
ret = -ENODEV;
if (fd_probe_drives() < 1) /* No usable drives */
goto out_probe;
@ -1791,7 +1827,6 @@ static int __init amiga_floppy_probe(struct platform_device *pdev)
return 0;
out_probe:
blk_cleanup_queue(floppy_queue);
out_queue:
free_irq(IRQ_AMIGA_CIAA_TB, NULL);
out_irq2:
@ -1810,9 +1845,12 @@ static int __exit amiga_floppy_remove(struct platform_device *pdev)
for( i = 0; i < FD_MAX_UNITS; i++) {
if (unit[i].type->code != FD_NODRIVE) {
struct request_queue *q = unit[i].gendisk->queue;
del_gendisk(unit[i].gendisk);
put_disk(unit[i].gendisk);
kfree(unit[i].trackbuf);
if (q)
blk_cleanup_queue(q);
}
}
blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
@ -1820,7 +1858,6 @@ static int __exit amiga_floppy_remove(struct platform_device *pdev)
free_irq(IRQ_AMIGA_DSKBLK, NULL);
custom.dmacon = DMAF_DISK; /* disable DMA */
amiga_chip_free(raw_buf);
blk_cleanup_queue(floppy_queue);
unregister_blkdev(FLOPPY_MAJOR, "fd");
}
#endif